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This gemstone testing device is not only a diamond tester but also a multi-gemstone tester. It can detect whether gemstones are real or fake, including: diamonds, sapphires, rubies, crystals, agate, emeralds and other precious stones of various sizes.If the number of lights is equal to or more than 9 and it beeps, it means the diamond is real. If the lights are about 9 and it beeps, it means the sapphire is real. If the number is 6.5-7, it means agate is correct. If the number is 7-8, it means the crystal is real. If the number is 6-7, it means the jade is real.Before testing: 1. Place the battery in the tester. 2. Remove the probe cover. 3. Turn on the switch. 4. Make sure that only one light is on on the scale. 5. Make sure the Ready Light is on. 6. (If testing diamonds, you need to turn on the light corresponding to the room temperature and diamond weight.) 7. (If testing other gemstones, you'd better calibrate the probe, method: place the probe vertically on the glass, then Adjust the light to 5, then test the gem.)NOTE: No matter what gem you are testing, the probe and the test object must be at a 90 angle. When testing diamonds, the correct index finger must continue to touch the metal panel on the back of the tester, and not the panel if you are testing other stones. Do not test any metal. Do not wear gloves.Product size: 16x4x2.2cm. Weight: 100 grams. Power supply: 1 x 9V battery (not included in the scope of supply).Colour: BlackMaterial: PlasticPackage Contents:1 * Diamond testerOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.